Change Static IP w/ Mac Clone

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I recently got my Netduma R1 and my ISP has told me multiple times that I have a static IP that cant be changed unless I go into their store and swap out the modem with a new one. I've been hearing that it might be possible to change the IP via mac cloning, but im not entirely sure on how to do this. I attempted once but it didn't seem to work. I went into WAN settings. Enabled Mac Address Clone. Typed in a different MAC address. Clicked Apply. Shut off router and modem for 3 minutes or so, but my IP is still the same. Am I doing something wrong?